Taking a page from Taco Bell, which used Doritos in a successful product launch, 7-Eleven plans to offer a snack filled with melted cheese and covered in a crunchy seasoning that tastes like Nacho Cheese Doritos.

The launch of Doritos Loaded comes as Dallas-based 7-Eleven continues its bid to attract diners as well as shoppers. Over the years, as cigarette sales have declined, the company has beefed up its prepared food offerings.

Area residents will have two chances to taste the new snack for free Tuesday — from 10 a.m. to 2 p.m. at the 7-Eleven at 1010 Ross Ave. downtown and from 5 to 9 p.m. at the 7-Eleven at 3716 Maple Ave. Samples, handed out from a food truck, will be free while supplies last.

Snackers can track where Doritos Loaded will pop up next at www.7-eleven.com/doritosloaded.

The sampling event, one of several planned in the U.S., precedes an early July national roll out. A box of four has 350 calories and will sell for $1.99.

The snack was developed by the Plano-based research and development team for PepsiCo, parent of Frito-Lay. The nation’s largest snack maker also is based in Plano.

Frito-Lay teamed up with former corporate cousin Taco Bell to launch Doritos Locos Tacos in March of 2012. Theingredients in the chain’s “taco supreme”are served in a shell made from Doritos chips.

Executives with Taco Bell’s parent, Yum Brands, have called Doritos Locos Tacos the company’s most successful product launch, with more than 800 million sold so far.